What does it mean to recruit "three fires" in Chinese restaurants?

The three fires mentioned in the recruitment of Chinese restaurants may refer to: big fire, medium fire and small fire.

Wanghuo: Wanghuo is also called big fire, urgent fire or violent fire. The pillar of fire will stick out of the pot, and the flame will be high and steady. The color of fire is blue and white, and the heat is pressing. The cooking speed is fast, which can keep the freshness of the materials and the softness of the taste. Suitable for cooking methods such as raw frying, sliding frying and frying. ?

Medium fire: Medium fire is also called civil and military fire or slow fire, and its firepower is between flourishing fire and small fire. The pillar of fire protrudes slightly from the side of the pot, and the flame is low and unstable. The flame is blue-red and bright. Generally suitable for cooking foods with more sauces, such as cooking and frying. ?

Small fire: Small fire is also called slow fire or warm fire. The pillar of fire will not extend out of the pot, and the flame is small and sometimes high and sometimes low. The light is blue-orange, the luminosity is dark and the heat is low. Generally suitable for slow-cooked or non-perishable vegetables, suitable for dry-frying, burning, boiling and other cooking. ?